https://scholars.lib.ntu.edu.tw/handle/123456789/369523
標題: | Magnetically recyclable Fe@Co core-shell catalysts for dehydrogenation of sodium borohydride in fuel cells | 作者: | Tsai, C. W. Chen, H. M. Liu, R. S. Lee, J. F. Chang, S. M. Weng, B. J. RU-SHI LIU HAO MING CHEN |
關鍵字: | Core-shell catalyst; Hydrogen generation; Magnetic recycle; Sodium borohydride; X-ray absorption spectroscopy | 公開日期: | 2012 | 卷: | 37 | 期: | 4 | 起(迄)頁: | 3338-3343 | 來源出版物: | International Journal of Hydrogen Energy | 摘要: | Co-based catalysts of the reaction by which hydrogen was obtained from NaBH4 solution were prepared by chemical reduction in a liquid phase. X-ray diffraction and scanning electron microscopy analyses showed that the as-prepared Fe@Co catalyst was ultrafine and amorphous. The calculated Arrhenius activation energy of the Fe@Co catalyst was 35.62(1) kJ mol-1 while that of the Co catalyst was 38.81(2) kJ mol-1, demonstrating that Fe@Co nanoparticles reduce the activation energy of the reaction more than does a Co nanocatalyst. X-ray absorption spectroscopy (XAS) clearly reveals the valences of Fe and Co. The Fe valence of Fe@Co is smallest among three catalysts because of the Co shell. The molar ration of Fe to Co is 1: 2 as determined by using XPS analysis, indicating that the novel catalyst reduces costs. The generation of hydrogen is schematically elucidated. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. |
URI: | http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000301615100039&KeyUID=WOS:000301615100039 http://scholars.lib.ntu.edu.tw/handle/123456789/369523 |
DOI: | 10.1016/j.ijhydene.2011.11.038 | SDG/關鍵字: | Arrhenius activation energy; Chemical reduction; Co catalysts; Co Nanoparticles; Co-based catalysts; Core-shell; Fe valence; Hydrogen generation; Liquid Phase; Magnetic recycle; Nano-catalyst; Novel catalysts; Scanning electrons; Sodium borohydride; Sodium borohydrides; Ultrafine; XPS analysis; Activation energy; Hydrogen; Hydrogen production; Nanomagnetics; Scanning electron microscopy; Semiconducting bismuth compounds; Sodium; X ray absorption spectroscopy; X ray diffraction; Catalysts |
顯示於: | 化學系 |
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